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'ngrep' provides most of GNU grep's common … 'ngrep' provides most of GNU grep's common features and applies them to the network layer. It is a pcap-aware tool that lets you specify extended regular or hexadecimal expressions to match against data payloads of packets. It currently recognizes TCP, UDP, ICMP, IGMP, and Raw protocols across Ethernet, PPP, SLIP, FDDI, Token Ring, 802.11 and null interfaces, and understands bpf filter logic in the same fashion as more common packet sniffing tools, such as tcpdump and snoop.sniffing tools, such as tcpdump and snoop.

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